Finding the Third Proportional to 18,531 and 39,970.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,531 : 39,970.50 = 39,970.50 : x
2. Step 2: Convert to fraction form
   18,531/39,970.50 = 39,970.50/x
3. Step 3: Cross multiply
   18,531x = 39,970.50 × 39,970.50
4. Step 4: Simplify right side
   18,531x = 1,597,640,870.25
5. Step 5: Solve for x
   x = 1,597,640,870.25/18,531
6. Step 6: Final answer
   x = 86,214.50